#!/bin/bash
#Author:mlin
#脚本针对RHEL7
cat >> /usr/lib/sysctl.d/00-system.conf <<EOF
fs.file-max=65535
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 30
#net.ipv4.tcp_keepalive_time = 120
net.ipv4.ip_local_port_range = 1024  65535
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 5010 641280 5010 128
net.core.wmem_default=262144
net.core.wmem_max=262144
net.core.rmem_default=4194304
net.core.rmem_max=4194304
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_sack = 0
EOF

sysctl –p